Henby b



(No Model.) H. E. WAITB.

TBL'PHONB TRANSMITTBR.

Patented Nov. 29,1881.

UNITED STATES PATENT OFFICE.

HENRY E. WAITE, OF BRIDGEPORT, OONNEGTIOUT, ASSIGNOR TO CHARLES F.LIVERMORE, OF SAME PIJAOE.

TELEPHONE-TRANSM ITTER.

SPECIFICATION formng` part of Letters Patent No. 250,308, dated November29, 1881.

Application filed June 8, 1881.

To all whom it may concern Be it known that I, HENRY EWAITE, ofBridgeport, county of Fairfield, State of Connecticut, have inventedcertain new and useful Improvements in Telephone-Transmitters,

of which the following is a full and exact description, reference beinghad to the accompanying drawings, making part ot' this specification, inwhich- Io Figure 1 is a plan or top view of my improved txansmitter withthe cap-plate or cover removed, and Fig. 2 is a Vertical section throughthe same.

My invention relates to a novel arrangement [5 of the carbon orconductor plates of the transmitter; and it consists in the combination,with a grooved or flanged base-plate of carbon or equivalent material,of inclined plates of similar material resting upon said base-plate zoand forming a series of two ormorelight contacts, as hereinafterexplained.

In the accompanying drawings, A represents a box or case, made, bypreference, of cork; but it may be made of any non-resonant material,within which is placed a block orbaseplate, B, of carbon or othersuitable conductin g material, made, by preference, with Verticalflanges b b' at the sides, as shown, and above these are suspendedplates O C', either or both,

of carbon or its equivalent, said plates being pivoted at d by hooks oreyes, hinging' their upper edges to the side walls in such manner as tohold the plates pendent, with theirlower edges resting` againstthe innerfaces of the flanges b b' or the base-plate B, in such manner as to givethem the inclined position shown, in which the tendency of the weight ofsaid plates to swing,` into a Vertical position keeps them in contactwith the base-plate B at their 40 lower edges, as shown. Where but asingle hinged plate is used the wires will be connected, one with saidplate and the other with the base-plate; but where two are used thewires will be connected, one with one of said hinged plates and theotherwvith the other, as shown, the base-plate servingr to connect them.These plates, instead of being made in one piece, may be composed ofseveral pieces or sheets resting one upon another, as shown at 0/, thusproducing' the multiple contact or number of contacts described inanother application, filed (No model.)

May 23, 1881, and the base-plate B may, if desired, be formed in asimilar manner.

The form of the carbon pieces may be varied, of course, so long as thehinged and inclined relation of one part to the other is maintained,adapting it to rest in vibx'atory contact therewith, and the form ot'the box, case, or support A also may be changed, its essental feature ofconstruction being` that it shall be adapted to support the carbonplates or conductors, one in a suspended and inclined relation to theother, as described, though the inclosing-case 'ofcork or equivalentnon-resonant material described is preferrcd, as in the latterconstruction the case serves, through molecular disturbance due to theaction of the atmospheric sound-Wavesimpinging upon its surface, toconvey such disturbance to the microphone. Vhere other material is usedfor the case the cover should be raised or left off, so as to expose themicrophone to the direct ac; tion of the sound-Waves.

In the microphone described it will be readilyunderstood that whiletheparts thereof rest always in contact, such contact is more readilydisturbed by the sound-Waves or molecular disturbance referred to thanWhere the parts are so arranged that one has to support the entireweightof the others, and the sensitiveness of the microphone to the action ofthe sound-Waves or under molecular disturbance is correspondinglyincreased.

Having` now Adescribed my invention, I claim 8 5 1. In atelephonetransmitter, the grooved or fianged block, of carbon orequiva-lent conducting' material, in combination with the inclinedplates, of similar material, restingin contact with` said block onopposite sides thereof, substantally as described.

2. The combination,in a telephone-transmitter, of the fiang'ed blockorbase-plate, ofcarbon or equivalent conducting material, and thelaminated plates or leaves, of similar material, 93 suspended in aninclined position and resting thereon, for giving a light multiplecontact, substantially as described.

HENRY E. WAITE.

Witnesses: t

CHARLES HANKINsoN, FREDERIG (J. BARTLETT.

